Author Topic: Which oscillators to buy for CPLD project  (Read 1174 times)

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Offline garvind25Topic starter

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Which oscillators to buy for CPLD project
« on: December 21, 2017, 09:59:03 am »
Hi,

 I was looking forward to buy an oscillator for my CPLD project. Can anyone pls. point exactly to which device I can buy (25/50 MHz; preferably SMD). The ones at aliexpress are low cost (hence tempted to buy those ) but dont have datasheets attached with them. The devices at utsource are either low cost and without datasheets or about 10-11 dollars a piece!

Thanking You,
Arvind Gupta.
 

Offline rstofer

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Re: Which oscillators to buy for CPLD project
« Reply #1 on: December 21, 2017, 10:04:08 pm »
If the question is "Which is the best of the worst?", I don't know.l  I buy first line parts from Digikey or Mouser.  It improves the odds that my project will run.

Selecting a quality part should be as easy as matching the desired frequency with the required Vcc and drive level (HCMOS, LVTTL, etc).  Digikey has a selection tool.

Lacking any knowledge of your CPLD, I chose 25 MHz 3.3V  LVCMOS drive level and came up with a cost of $1.13.  You need to check the CPLD datasheet to determine which drive level is required.  It might be LVTTL...

https://www.digikey.com/product-detail/en/sitime/SIT8008BI-13-XXS-25.000000G/1473-30687-2-ND/6080749

I linked the qty 250 part because the qty one part doesn't have a picture

https://www.digikey.com/product-detail/en/sitime/SIT8008BI-13-XXS-25.000000G/1473-30687-1-ND/7559748
 
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Offline garvind25Topic starter

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Re: Which oscillators to buy for CPLD project
« Reply #2 on: December 23, 2017, 11:21:54 am »
Thanks for the reply. The digikey website chages a lot for delivering here in New Delhi! So do you know of any chinese vendors for such parts pls (usually they give free / low cost delivery options)

Thanks again,
Arvind Gupta
 

Offline rstofer

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Re: Which oscillators to buy for CPLD project
« Reply #3 on: December 23, 2017, 04:52:52 pm »
Sure, just add 'china' to a search for 'crystal oscillator'

https://www.alibaba.com/product-detail/25MHz-3-3V-5032-quartz-oscillator_60439909880.html?s=p

I don't buy from China because it takes too long to get the parts.  Nevertheless, they do have cheap shipping and much lower prices.
 


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